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SAMSUNG S27A850D monitor, capable of 2560x1440 resolution it has DVI input
i attached the HDMI output from my Acer 5742g notebook using an adaptor
unfortunately the computer has an Optimus NVIDIA GT540M, and i use Bumblebee, the default driver is therefore the intel one
the monitor is recognised and the EDID read, but the maximum resolution in the settings is 1920x1200
adding a New Mode with xrandr i can get the full resolution:

Comment

HDMI does support 2560x1600, however, almost no monitors (or laptops) do. You can only run analog hdmi convertors up to 1920x1200, for resolutions above that you need an active component, which is more expensive to make. Extremely few monitors have this (I''ve seen some korean models with it, and I'm fairly sure that samsung does not have it).

Your only option here is to run at a lower refresh rate, which should reduce the bandwidth enough to be usable (although not for gaming/anything fast paced).

Unfortunatly support for this isn't documented very often... I contacted the manufacturer of the laptop I have, and they couldn't tell me whether or not it had a hdmi chip with this capability.